Iron core for stationary induction apparatus and stationary induction apparatus

Abstract

An iron core ( 1, 11, 31 ) for a stationary induction apparatus according to one embodiment is configured by laminating a plurality of electromagnetic steel plates ( 5, 16, 33 ). The electromagnetic steel plates are laminated so that joint parts ( 6, 17, 18, 32 ), at which the end portions of the electromagnetic steel plates abut one another, are disposed in a staggered manner; and the electromagnetic steel plates are provided with a magnetic domain fine differentiation processed part ( 7, 19, 34 ), which is located on the portion, of a surface of the end portion of each of the electromagnetic steel plates, lapped with the joint part of another electromagnetic steel plate, and which has been subjected to warping-derived magnetic domain fine differentiation.

The invention claimed is: 
     
       1. An iron core for a stationary induction apparatus, the iron core comprising:
 a plurality of electromagnetic steel plates laminated to form the iron core, wherein the electromagnetic steel plates are laminated so that joint parts, at which end portions of the electromagnetic steel plates abut one another, are disposed in a staggered manner; and 
 a respective magnetic domain fine differentiation processed part of each of the electromagnetic steel plates, which is located on a portion of a surface of the end portion of each of the electromagnetic steel plates, lapped with the joint part of another electromagnetic steel plate, and which has been subjected to magnetic domain fine differentiation, in which a magnetic domain is fine differentiated by warping, wherein: 
 each respective magnetic domain fine differentiation processed part is formed by a plurality of linear marks extending in two intersecting directions in a grid pattern on the surface of the electromagnetic steel plate, 
 each respective magnetic domain fine differentiation processed part is on at least one of the surfaces of the end portions of the electromagnetic steel plate and located on one side or both sides of the joint part, across the surface of the end portion of the electromagnetic steel plate, in which a magnetic flux lies over the overlapping electromagnetic steel plate, and the length of twice a pitch p of the displacement of the joint part, and 
 some of the linear marks extend in a rolling direction of the electromagnetic steel plate, and other linear marks extend in a direction orthogonal to the rolling direction of the electromagnetic steel plate. 
 
     
     
       2. The iron core for the stationary induction apparatus according to  claim 1 , wherein each respective magnetic domain fine differentiation processed part is provided all over or partially in a width direction orthogonal to a rolling direction of the electromagnetic steel plate. 
     
     
       3. The iron core for the stationary induction apparatus according to  claim 1 , wherein the iron core is one of:
 a wound iron core configured by winding and laminating a plurality of strip-like electromagnetic steel plates while providing at least one joint part for each roll; and 
 a laminated iron core configured by laminating a plurality of the electromagnetic steel plates so that yoke parts and led parts are formed and abut one another at joint parts. 
 
     
     
       4. A stationary induction apparatus comprising:
 an iron core, the iron core being configured by laminating a plurality of electromagnetic steel plates, wherein the electromagnetic steel plates are laminated so that joint parts, at which end portions of the electromagnetic steel plates abut one another are disposed in a staggered manner; and 
 a respective magnetic domain fine differentiation processed part of each of the electromagnetic steel plates, which is located on a portion of a surface of the end portion of each of the electromagnetic steel plates, lapped with the joint part of another electromagnetic steel plate, and which has been subjected to magnetic domain fine differentiation, where a magnetic domain is fine differentiated by warping, wherein: 
 each respective magnetic domain fine differentiation processed part formed by a plurality of linear marks extending in two intersecting directions in a grid pattern on the surface of the electromagnetic steel plate, 
 each respective magnetic domain fine differentiation processed part is on at least one of the surfaces of the end portions of the electromagnetic steel plate and located on one side or both sides of the joint part, across the surface of the end portion of the electromagnetic steel plate in which a magnetic flux lies over the overlapping electromagnetic steel plate, and the length of twice a pitch p of the displacement of the joint part, and 
 some of the linear marks extend in a rolling direction of the electromagnetic steel plate, and other linear marks extend in a direction orthogonal to the rolling direction of the electromagnetic steel plate. 
 
     
     
       5. The stationary induction apparatus according to  claim 4 , wherein each respective magnetic domain fine differentiation processed part is provided all over or partially in a width direction generally orthogonal to a rolling direction of the electromagnetic steel plate. 
     
     
       6. The stationary induction apparatus according to  claim 4 , wherein the iron core is one of:
 a wound iron core configured by winding and laminating a plurality of strip-like electromagnetic steel plates while providing at least one joint part for each roll; and 
 a laminated iron core configured by laminating a plurality of the electromagnetic steel plates so that yoke parts and leg parts are formed and abut one another at joint parts.